package com.insigma.business.common.utils;

import cn.com.taiji.common.utils.StringUtils;
import cn.com.taiji.framework.util.sm4.SM4;
import cn.com.taiji.framework.util.sm4.SM4_Context;
import cn.com.taiji.framework.util.sm4.Sm4Util;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Sm4Tool {
    private String secretKey = "11HDESaAhiHHugDz";
    private String iv = "";
    private boolean hexString = false; 
    
    private static Sm4Tool instance = new Sm4Tool();
    
    public Sm4Tool()
    {
    }
    
    public static Sm4Tool getInstance() {
    	return instance;
    }
    
    public static String encryptDataECB(String plainText) {
        if(StringUtils.isEmpty(plainText)){
            return null;
        }
    	return getInstance().encryptData_ECB(plainText);
    }
    
    public static String decryptDataECB(String plainText) {
        if(StringUtils.isEmpty(plainText)){
            return null;
        }
    	return getInstance().decryptData_ECB(plainText);
    }
    
    public String encryptData_ECB(String plainText)
    {
        try 
        {
            SM4_Context ctx = new SM4_Context();
            ctx.isPadding = true;
            ctx.mode = SM4.SM4_ENCRYPT;
            
            byte[] keyBytes;
            keyBytes = secretKey.getBytes();
            SM4 sm4 = new SM4();
            sm4.sm4_setkey_enc(ctx, keyBytes);
            byte[] encrypted = sm4.sm4_crypt_ecb(ctx, plainText.getBytes("UTF-8"));
            String cipherText = new BASE64Encoder().encode(encrypted);
            if (cipherText != null && cipherText.trim().length() > 0)
            {
                Pattern p = Pattern.compile("\\s*|\t|\r|\n");
                Matcher m = p.matcher(cipherText);
                cipherText = m.replaceAll("");
            }
            return cipherText;
        } 
        catch (Exception e) 
        {
            e.printStackTrace();
            return null;
        }
    }
    
    public String decryptData_ECB(String cipherText)
    {
        try 
        {
            SM4_Context ctx = new SM4_Context();
            ctx.isPadding = true;
            ctx.mode = SM4.SM4_DECRYPT;
            
            byte[] keyBytes;
            keyBytes = secretKey.getBytes();
            SM4 sm4 = new SM4();
            sm4.sm4_setkey_dec(ctx, keyBytes);
            byte[] decrypted = sm4.sm4_crypt_ecb(ctx, new BASE64Decoder().decodeBuffer(cipherText));
            return new String(decrypted, "UTF-8");
        } 
        catch (Exception e) 
        {
            e.printStackTrace();
            return null;
        }
    }
    
    public String encryptData_CBC(String plainText){  
         try{  
                SM4_Context ctx = new SM4_Context();
                ctx.isPadding = true;  
                ctx.mode = SM4.SM4_ENCRYPT;
                  
                byte[] keyBytes;  
                byte[] ivBytes;  
               
                keyBytes = secretKey.getBytes();  
                ivBytes = iv.getBytes();  
                  
                SM4 sm4 = new SM4();
                sm4.sm4_setkey_enc(ctx, keyBytes);  
                byte[] encrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, plainText.getBytes("UTF-8"));  
                String cipherText = new BASE64Encoder().encode(encrypted);  
                if (cipherText != null && cipherText.trim().length() > 0)  
                {  
                    Pattern p = Pattern.compile("\\s*|\t|\r|\n");  
                    Matcher m = p.matcher(cipherText);  
                    cipherText = m.replaceAll("");  
                }  
                return cipherText;  
            }   
            catch (Exception e)   
            {  
                e.printStackTrace();  
                return null;  
            }  
        }  
          
        public String decryptData_CBC(String cipherText)  
        {  
            try   
            {  
                SM4_Context ctx = new SM4_Context();
                ctx.isPadding = true;  
                ctx.mode = SM4.SM4_DECRYPT;
                  
                byte[] keyBytes;  
                byte[] ivBytes;  
                if (hexString)  
                {  
                    keyBytes = Sm4Util.hexStringToBytes(secretKey);
                    ivBytes = Sm4Util.hexStringToBytes(iv);
                }  
                else  
                {  
                    keyBytes = secretKey.getBytes();  
                    ivBytes = iv.getBytes();  
                }  
                  
                SM4 sm4 = new SM4();
                sm4.sm4_setkey_dec(ctx, keyBytes);  
                byte[] decrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, new BASE64Decoder().decodeBuffer(cipherText));  
                return new String(decrypted, "UTF-8");  
            }   
            catch (Exception e)  
            {  
                e.printStackTrace();
                return null;  
            }  
        }  
          
    
    public static void main(String[] args) throws IOException 
    {
        System.out.println(Sm4Tool.decryptDataECB("w+ThWgzypoTUc6wUJ2hrphooZYTbhl4IzTRIptWegeU="));
        
    }
}